'PostgreSQL9.6.10 the output of vacuumdb is right?

PostgreSQL7.0

input command: vacuumdb -z XXX Outputs: VACUUM →Everything went well.

PostgreSQL8.3.7

input command: vacuumdb -z XXX Outputs: nothing → Everything went well.

PostgreSQL9.6.10

input command:vacuumdb -z

outputs: vacuumdb: vacuuming database "XXXX" → the reslut of vacuumdb command is ok?



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